Rotary pump



P. R. HATTON ROTARY P UMP April 22 1924. 1,491,262A

Filed March 17. 1922 2 sheets-Sheer 1 April 22 ,1924. 7 1,491,262

P. R. HATTON ROTARY PUMP Filed March 17'. '1922 2 sneeze-sheet. 2

Patented Apr. Z2, 1924.

PHILIP Bf. HATTON, F LEBANON, NEW HAMPSHIRE.

ROTARY PUMP.

Application led March 17, 1922. Serial No. 544,490.

To aZZ zc/tom t may concern.'

Be it known that I, PHILIP R. HATTON, a citizen of the United States, residing at Lebanon, in the county of Grafton and State of New Hampshire, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

The invention has for an' object to effect improvements in valves of rotary pumps and the like, and particularly aims to improve the manufacture of the valve element whereby its functioning will be more efficient, and whereby it may be produced economically. A further aim is to improve the specific ccnstruction of an abutment suitable for air and vacuum, to increase its efficiency.

Additional objects, advantages and features of invention may reside in the construction, arrangement and combination of parts as hereinafter more particularly de-V scribed and shown in the drawings, where- 1n,

Figure 1 is a vertical sectional view of an engine suitable for pumping,constructed in' accordance with my invention,

Fig. 2 is a detail of the abutment therein,

Fig. 3 is a fragmentary sectional view at right angles to Fig. 1,

Fig. 4 is a cross section of a further modificaticn of the abutment,

Fig. 5 is a similar viewfat right angles to Fig.- 6,

F ig. 6 is a fragmentary section of an engine showing the last mentioned form of abutment as installed. l

rlihere is illustrated an engine comprising a casing 10 having a circular chamber 11 therein, closed at each side by plates 12. In the plates 12 there is revolubly mounted a shaft 13 having an eccentric portion 14 slightly greater in length than the width of the chamber, the plates 12 being suitably recessed to accommodate this eccentricity for proper movement. there is pinned a rotor 16, similarly eccentric with respect ,to the shaft 13 but nearly or quite concentric with the part 14. The periphery 0f the rotor is thus brought close to the interior periphery of the chamber 11, at one part and at this part a transverse packing plate 17 is mounted, borne outward by a spring 18 engaged in a suitable recess in the rotor. The rotor may be secured upon the eccentric 14 in any usual manner found most practicable.

Upon the eccentric y14V In the sides of the rotor, extending from the eccentric 14 outwardly over the ends of the packing member 17, there are lateral packing plates 19, set in suitable grooves or channels in the sides of the rotor and held outwardly by lsprings 20. The ends of the packing members are preferably channelled to fit snugly around the plates 19, and eX- tend into close proximity with the head plate 12 on each side of the plates 19. An inlet port 21 is formed in the upper part of the casing, which port extends from a cylindrical interiorly threaded passage 22 at the outer part, being broadened transversely at the inner part, and Where it enters the chamber 11 close to the abutment it is narrowed circumferentially of the chamber so as to limit the action of the rotor as a piston, to the minimum degree. An outlet port 24 is formed closely adjacent the port 21, one wall 25 of the passage leading from the port 24 being curved concentrically with an axis located outwardly of the opposite side of the passage a suitable distance, and a cylindrical bearing bore 26 is formed in the bodyiof the casing 10 havingkthe same axis,

the side of the passage 24 is cut away to form an opening into the bore 26, through which a valve or abutment member 27 may project as will be described. rPhe abutment member comprises in the present instance a section of cylindrical steel bar of very large diameter snugly fitting the bore 26 and channelled at one side so as to receive snugly a body block 29, comprising the abutment proper. This block may be welded or other- Wise secured in the member 2S. The opening from the bore 26 to the passage 24 is such as to permit free oscillation of the abutment 27 as required, and the port 24is of such extent that the abutment swings into the chamber 11 until it engages the periphery of the rotor at its part of minimum radius, asshown in Fig. 3, the abutment being at such time located at an acute angle tc the engaged periphery of the rotor. The end of the abutment is arranged to swing closely adjacent the wall 25, and a spring 30 is compressed between the abutment 27 and a mounting screw 31 engaged through a suitable threaded opening in the casing 10, through which the spring may be inserted, followed by the screw. The abutment 27 is formed with a channel'on the outer side neat tothe passage 24, which opens through the outer or swinging end of the abutment, so

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as to receive fluid from the chamber l1 compressed by the piston, for passage outwardly through the port 24. The spring 30 is engaged upon a nib 32 formed in the bottom of the channel, whereby the spring is prevented from becoming displaced. In each side of the abutment, a diagonal channel is formed, extending from closely adjacent the lower side of the abutment at its outer part, and entirely across the end of the member 28. In these channels there are set packing plates 33, pressed outwardly by springs so that iuid compressed on one side of the abutment cannot pass to the other. The abutment is also 'formed with small shallow recesses 34 in its outer side, which receive lugs 35 carried by packing plates 36, slidable in channels 37 extending radially with respect to the shaft 13 in the head plates 12, and having a depth corresponding to the depth of the recesses 15 which receive the eccentric 14. The plates 36 may be borne inwardly against the rotor by means of the springs 37 in the head plates 12. The plates may snugly abut the periphery of the eccentric 14, and by reason of the manner in which they are connected to the abutment 27 will be moved inwardly and outwardly by the action of the rotor, without undue wear against the eccentric 14, but maintain a close joint there, whereby leakage next the shaft will be minimized.

The manner of construction of the abutment 27 has special advantages in such engines, in minimizing wear upon the pivot of the abutment and permitting a snug closureA of t-he space between the abutment and walls of the casing and at the sides of the rotor at all times. In engines of this type there is an unusual amount of vibration, and shock, owing to the extremely high speed and hammer-like action of the piston, and it has been a problem to provide an adequate bearing to sustain such shock and wear in an oscillating abutment, in an economical manner. The body of the abutment may be formed from stock material, or from forgings, and its fitting to the pivot element 28 involves simple and inexpensive operations without encountering diiiiculties in securing a snu lit.

In Iigs. 5, 6, and 7 there is shown a kmodilication of the abutment, in which means is provided for passage or compressed iiuid laterally through the abutment, the radius of oscillation of which may be comparatively short in this inst-ance, and the mounting of which with respect to the outlet port is very `much similar to that described in the irst instance, and shown in Fig. 3. However, the iiuid compressed is permitted to pass transversely through the abutment, by means of a passage way 40, which is slightly restricted at its lower or inner end, adjacent the chamber 11, both at the ends and the sides,

so that a cylinder 41 may snugly lit this reduced portion and rest thereon after the manner of a ballvvalve, as shown in Fig. 5, a spring 42 being utilized to hold the valve 4l lightly to its seated position. A packing plate 43 is also shown in this instance mounted in the casing so as to bear against the outer swinging end of the abutment, being so held by reason of a spring 44 coniined against the plate by a screw 45 inserted from the outer side of the casing.

It should be noted that by mounting of the rotor upon the eccentric 14, torsional strain upon whatever key device may be utilized is largely reduced, which is of considerable advantage in devices of this kind operating at high speed and great vibration. It minimizes liability of loosening of the rotor upon its shaft, and also minimizes wear upon pins, jibs, or keys, as will be appreciated.

What is claimed 1. In a device of the character described, a cylindrical casing, a revoluble shaft concentrically mounted therein, an integral eccentric cylindrical enlargement on the shaft, and a cam piston mounted on the eccentric, said enlargement being of greater len h than the width of the piston, said casing ing recessed to permit movement of the enlargement therein as required, an abutment, grooves being Jformed at each side of the rotor in said casing, and packing plates slidable in the grooves abutting the enlargement and means to move the plates inward with the enlargement.

2. In a device of the character described a cylindrical chambered casing, a cam piston rotatable therein, an oscillatable abutment mounted in the casing arranged to lie Vaga-inst the piston to be oscillated by the piston, said casing being recessed to accommodate the abutment at the outer limit of its movement, a port opening into the chamber adjacent the abutment, a port opening into the recess adjacent the abutment, a passage being formed in the abutment opening opposite the first port when at its inner position and forming communication with the second port, thev passage having a seat therein at one part elongated and rectilinear, and a cylinder arranged to engage the seat, the seat being curved at the ends on a radius corresponding to the radius of the cylinder, and the ends of the cylinder being similarly spherical.

3. In a device of the character described, a cylindrical chambered casing, a cam piston rotatable therein, an oscillating abutment pivoted in the casing to lie obliquely against the piston to be oscillated by the piston, a port opening into the chamber adjacent the abutment, said casing being recessed to accommodate the abutment at the outer limit of its movement, a port opening into said and the chamber when the abutment is ex.

tended in the chamber, the abutment and piston being of equal Width, a peeking plate set in the abutment extending from its pivoted end to its swinging end, resilient means bearing the plates from the abutment packing plates set in the side Walls of the chambe overlapping the first named plates a distance, and resilient means bearing the second named packing plates against the pist0n and abutment and first pecking plates.

4. A structure as recited in claim 3, in which an extension is formed at each side of the piston corresponding in eccentricity to the cem form of the piston, the sides of the chamber being recessed to receive the extensions and the second named packing means abut snugly the extensions peripherally and ere connected to the abutment for movement therewith.

PHILIP R. HATTON. 

